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718e3744 | 1 | /* Kernel communication using routing socket. |
2 | * Copyright (C) 1999 Kunihiro Ishiguro | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | * 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "if.h" | |
25 | #include "prefix.h" | |
26 | #include "sockunion.h" | |
27 | #include "connected.h" | |
28 | #include "memory.h" | |
29 | #include "ioctl.h" | |
30 | #include "log.h" | |
31 | #include "str.h" | |
32 | #include "table.h" | |
33 | #include "rib.h" | |
edd7c245 | 34 | #include "privs.h" |
718e3744 | 35 | |
36 | #include "zebra/interface.h" | |
37 | #include "zebra/zserv.h" | |
38 | #include "zebra/debug.h" | |
39 | ||
edd7c245 | 40 | extern struct zebra_privs_t zserv_privs; |
9bcdb638 | 41 | extern struct zebra_t zebrad; |
edd7c245 | 42 | |
718e3744 | 43 | /* Socket length roundup function. */ |
44 | #define ROUNDUP(a) \ | |
45 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) | |
46 | ||
47 | /* And this macro is wrapper for handling sa_len. */ | |
48 | #ifdef HAVE_SA_LEN | |
49 | #define WRAPUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len) | |
50 | #else | |
51 | #define WRAPUP(X) ROUNDUP(sizeof (struct sockaddr)) | |
52 | #endif /* HAVE_SA_LEN */ | |
53 | ||
54 | /* Routing socket message types. */ | |
55 | struct message rtm_type_str[] = | |
56 | { | |
57 | {RTM_ADD, "RTM_ADD"}, | |
58 | {RTM_DELETE, "RTM_DELETE"}, | |
59 | {RTM_CHANGE, "RTM_CHANGE"}, | |
60 | {RTM_GET, "RTM_GET"}, | |
61 | {RTM_LOSING, "RTM_LOSING"}, | |
62 | {RTM_REDIRECT, "RTM_REDIRECT"}, | |
63 | {RTM_MISS, "RTM_MISS"}, | |
64 | {RTM_LOCK, "RTM_LOCK"}, | |
65 | {RTM_OLDADD, "RTM_OLDADD"}, | |
66 | {RTM_OLDDEL, "RTM_OLDDEL"}, | |
67 | {RTM_RESOLVE, "RTM_RESOLVE"}, | |
68 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
69 | {RTM_DELADDR, "RTM_DELADDR"}, | |
70 | {RTM_IFINFO, "RTM_IFINFO"}, | |
71 | #ifdef RTM_OIFINFO | |
72 | {RTM_OIFINFO, "RTM_OIFINFO"}, | |
73 | #endif /* RTM_OIFINFO */ | |
74 | #ifdef RTM_NEWMADDR | |
75 | {RTM_NEWMADDR, "RTM_NEWMADDR"}, | |
76 | #endif /* RTM_NEWMADDR */ | |
77 | #ifdef RTM_DELMADDR | |
78 | {RTM_DELMADDR, "RTM_DELMADDR"}, | |
79 | #endif /* RTM_DELMADDR */ | |
80 | #ifdef RTM_IFANNOUNCE | |
81 | {RTM_IFANNOUNCE, "RTM_IFANNOUNCE"}, | |
82 | #endif /* RTM_IFANNOUNCE */ | |
83 | {0, NULL} | |
84 | }; | |
85 | ||
86 | struct message rtm_flag_str[] = | |
87 | { | |
88 | {RTF_UP, "UP"}, | |
89 | {RTF_GATEWAY, "GATEWAY"}, | |
90 | {RTF_HOST, "HOST"}, | |
91 | {RTF_REJECT, "REJECT"}, | |
92 | {RTF_DYNAMIC, "DYNAMIC"}, | |
93 | {RTF_MODIFIED, "MODIFIED"}, | |
94 | {RTF_DONE, "DONE"}, | |
95 | #ifdef RTF_MASK | |
96 | {RTF_MASK, "MASK"}, | |
97 | #endif /* RTF_MASK */ | |
98 | {RTF_CLONING, "CLONING"}, | |
99 | {RTF_XRESOLVE, "XRESOLVE"}, | |
100 | {RTF_LLINFO, "LLINFO"}, | |
101 | {RTF_STATIC, "STATIC"}, | |
102 | {RTF_BLACKHOLE, "BLACKHOLE"}, | |
103 | {RTF_PROTO1, "PROTO1"}, | |
104 | {RTF_PROTO2, "PROTO2"}, | |
105 | #ifdef RTF_PRCLONING | |
106 | {RTF_PRCLONING, "PRCLONING"}, | |
107 | #endif /* RTF_PRCLONING */ | |
108 | #ifdef RTF_WASCLONED | |
109 | {RTF_WASCLONED, "WASCLONED"}, | |
110 | #endif /* RTF_WASCLONED */ | |
111 | #ifdef RTF_PROTO3 | |
112 | {RTF_PROTO3, "PROTO3"}, | |
113 | #endif /* RTF_PROTO3 */ | |
114 | #ifdef RTF_PINNED | |
115 | {RTF_PINNED, "PINNED"}, | |
116 | #endif /* RTF_PINNED */ | |
117 | #ifdef RTF_LOCAL | |
118 | {RTF_LOCAL, "LOCAL"}, | |
119 | #endif /* RTF_LOCAL */ | |
120 | #ifdef RTF_BROADCAST | |
121 | {RTF_BROADCAST, "BROADCAST"}, | |
122 | #endif /* RTF_BROADCAST */ | |
123 | #ifdef RTF_MULTICAST | |
124 | {RTF_MULTICAST, "MULTICAST"}, | |
125 | #endif /* RTF_MULTICAST */ | |
126 | {0, NULL} | |
127 | }; | |
128 | ||
129 | /* Kernel routing update socket. */ | |
130 | int routing_sock = -1; | |
131 | ||
132 | /* Yes I'm checking ugly routing socket behavior. */ | |
133 | /* #define DEBUG */ | |
134 | ||
135 | /* Supported address family check. */ | |
136 | static int | |
137 | af_check (int family) | |
138 | { | |
139 | if (family == AF_INET) | |
140 | return 1; | |
141 | #ifdef HAVE_IPV6 | |
142 | if (family == AF_INET6) | |
143 | return 1; | |
144 | #endif /* HAVE_IPV6 */ | |
145 | return 0; | |
146 | } | |
147 | \f | |
148 | /* Dump routing table flag for debug purpose. */ | |
149 | void | |
150 | rtm_flag_dump (int flag) | |
151 | { | |
152 | struct message *mes; | |
153 | static char buf[BUFSIZ]; | |
154 | ||
81dfcaa2 | 155 | buf[0] = '0'; |
718e3744 | 156 | for (mes = rtm_flag_str; mes->key != 0; mes++) |
157 | { | |
158 | if (mes->key & flag) | |
159 | { | |
160 | strlcat (buf, mes->str, BUFSIZ); | |
161 | strlcat (buf, " ", BUFSIZ); | |
162 | } | |
163 | } | |
164 | zlog_info ("Kernel: %s", buf); | |
165 | } | |
166 | ||
167 | #ifdef RTM_IFANNOUNCE | |
168 | /* Interface adding function */ | |
169 | int | |
170 | ifan_read (struct if_announcemsghdr *ifan) | |
171 | { | |
172 | struct interface *ifp; | |
173 | ||
174 | ifp = if_lookup_by_index (ifan->ifan_index); | |
175 | if (ifp == NULL && ifan->ifan_what == IFAN_ARRIVAL) | |
176 | { | |
177 | /* Create Interface */ | |
178 | ifp = if_get_by_name (ifan->ifan_name); | |
179 | ifp->ifindex = ifan->ifan_index; | |
180 | ||
181 | if_add_update (ifp); | |
182 | } | |
183 | else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE) | |
184 | { | |
185 | if_delete_update (ifp); | |
186 | if_delete (ifp); | |
187 | } | |
188 | ||
189 | if_get_flags (ifp); | |
190 | if_get_mtu (ifp); | |
191 | if_get_metric (ifp); | |
192 | ||
193 | if (IS_ZEBRA_DEBUG_KERNEL) | |
194 | zlog_info ("interface %s index %d", ifp->name, ifp->ifindex); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | #endif /* RTM_IFANNOUNCE */ | |
199 | ||
200 | /* Interface adding function called from interface_list. */ | |
201 | int | |
202 | ifm_read (struct if_msghdr *ifm) | |
203 | { | |
204 | struct interface *ifp; | |
205 | struct sockaddr_dl *sdl = NULL; | |
206 | ||
207 | sdl = (struct sockaddr_dl *)(ifm + 1); | |
208 | ||
209 | /* Use sdl index. */ | |
210 | ifp = if_lookup_by_index (ifm->ifm_index); | |
211 | ||
212 | if (ifp == NULL) | |
213 | { | |
214 | /* Check interface's address.*/ | |
215 | if (! (ifm->ifm_addrs & RTA_IFP)) | |
216 | { | |
217 | zlog_warn ("There must be RTA_IFP address for ifindex %d\n", | |
218 | ifm->ifm_index); | |
219 | return -1; | |
220 | } | |
221 | ||
106d2fd5 | 222 | ifp = if_create (sdl->sdl_data, sdl->sdl_nlen); |
718e3744 | 223 | |
718e3744 | 224 | ifp->ifindex = ifm->ifm_index; |
225 | ifp->flags = ifm->ifm_flags; | |
226 | #if defined(__bsdi__) | |
227 | if_kvm_get_mtu (ifp); | |
228 | #else | |
229 | if_get_mtu (ifp); | |
230 | #endif /* __bsdi__ */ | |
231 | if_get_metric (ifp); | |
232 | ||
233 | /* Fetch hardware address. */ | |
234 | if (sdl->sdl_family != AF_LINK) | |
235 | { | |
236 | zlog_warn ("sockaddr_dl->sdl_family is not AF_LINK"); | |
237 | return -1; | |
238 | } | |
239 | memcpy (&ifp->sdl, sdl, sizeof (struct sockaddr_dl)); | |
240 | ||
241 | if_add_update (ifp); | |
242 | } | |
243 | else | |
244 | { | |
245 | /* There is a case of promisc, allmulti flag modification. */ | |
246 | if (if_is_up (ifp)) | |
247 | { | |
248 | ifp->flags = ifm->ifm_flags; | |
249 | if (! if_is_up (ifp)) | |
250 | if_down (ifp); | |
251 | } | |
252 | else | |
253 | { | |
254 | ifp->flags = ifm->ifm_flags; | |
255 | if (if_is_up (ifp)) | |
256 | if_up (ifp); | |
257 | } | |
258 | } | |
259 | ||
260 | #ifdef HAVE_NET_RT_IFLIST | |
261 | ifp->stats = ifm->ifm_data; | |
262 | #endif /* HAVE_NET_RT_IFLIST */ | |
263 | ||
264 | if (IS_ZEBRA_DEBUG_KERNEL) | |
265 | zlog_info ("interface %s index %d", ifp->name, ifp->ifindex); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | \f | |
270 | /* Address read from struct ifa_msghdr. */ | |
271 | void | |
272 | ifam_read_mesg (struct ifa_msghdr *ifm, | |
273 | union sockunion *addr, | |
274 | union sockunion *mask, | |
275 | union sockunion *dest) | |
276 | { | |
277 | caddr_t pnt, end; | |
278 | ||
279 | pnt = (caddr_t)(ifm + 1); | |
280 | end = ((caddr_t)ifm) + ifm->ifam_msglen; | |
281 | ||
282 | #define IFAMADDRGET(X,R) \ | |
283 | if (ifm->ifam_addrs & (R)) \ | |
284 | { \ | |
285 | int len = WRAPUP(pnt); \ | |
286 | if (((X) != NULL) && af_check (((struct sockaddr *)pnt)->sa_family)) \ | |
287 | memcpy ((caddr_t)(X), pnt, len); \ | |
288 | pnt += len; \ | |
289 | } | |
290 | #define IFAMMASKGET(X,R) \ | |
291 | if (ifm->ifam_addrs & (R)) \ | |
292 | { \ | |
293 | int len = WRAPUP(pnt); \ | |
294 | if ((X) != NULL) \ | |
295 | memcpy ((caddr_t)(X), pnt, len); \ | |
296 | pnt += len; \ | |
297 | } | |
298 | ||
299 | /* Be sure structure is cleared */ | |
300 | memset (mask, 0, sizeof (union sockunion)); | |
301 | memset (addr, 0, sizeof (union sockunion)); | |
302 | memset (dest, 0, sizeof (union sockunion)); | |
303 | ||
304 | /* We fetch each socket variable into sockunion. */ | |
305 | IFAMADDRGET (NULL, RTA_DST); | |
306 | IFAMADDRGET (NULL, RTA_GATEWAY); | |
307 | IFAMMASKGET (mask, RTA_NETMASK); | |
308 | IFAMADDRGET (NULL, RTA_GENMASK); | |
309 | IFAMADDRGET (NULL, RTA_IFP); | |
310 | IFAMADDRGET (addr, RTA_IFA); | |
311 | IFAMADDRGET (NULL, RTA_AUTHOR); | |
312 | IFAMADDRGET (dest, RTA_BRD); | |
313 | ||
314 | /* Assert read up end point matches to end point */ | |
315 | if (pnt != end) | |
316 | zlog_warn ("ifam_read() does't read all socket data"); | |
317 | } | |
318 | ||
319 | /* Interface's address information get. */ | |
320 | int | |
321 | ifam_read (struct ifa_msghdr *ifam) | |
322 | { | |
323 | struct interface *ifp; | |
324 | union sockunion addr, mask, gate; | |
325 | ||
326 | /* Check does this interface exist or not. */ | |
327 | ifp = if_lookup_by_index (ifam->ifam_index); | |
328 | if (ifp == NULL) | |
329 | { | |
330 | zlog_warn ("no interface for index %d", ifam->ifam_index); | |
331 | return -1; | |
332 | } | |
333 | ||
334 | /* Allocate and read address information. */ | |
335 | ifam_read_mesg (ifam, &addr, &mask, &gate); | |
336 | ||
337 | /* Check interface flag for implicit up of the interface. */ | |
338 | if_refresh (ifp); | |
339 | ||
340 | /* Add connected address. */ | |
341 | switch (sockunion_family (&addr)) | |
342 | { | |
343 | case AF_INET: | |
344 | if (ifam->ifam_type == RTM_NEWADDR) | |
345 | connected_add_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
346 | ip_masklen (mask.sin.sin_addr), | |
347 | &gate.sin.sin_addr, NULL); | |
348 | else | |
349 | connected_delete_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
350 | ip_masklen (mask.sin.sin_addr), | |
351 | &gate.sin.sin_addr, NULL); | |
352 | break; | |
353 | #ifdef HAVE_IPV6 | |
354 | case AF_INET6: | |
355 | /* Unset interface index from link-local address when IPv6 stack | |
356 | is KAME. */ | |
357 | if (IN6_IS_ADDR_LINKLOCAL (&addr.sin6.sin6_addr)) | |
358 | SET_IN6_LINKLOCAL_IFINDEX (addr.sin6.sin6_addr, 0); | |
359 | ||
360 | if (ifam->ifam_type == RTM_NEWADDR) | |
361 | connected_add_ipv6 (ifp, | |
362 | &addr.sin6.sin6_addr, | |
363 | ip6_masklen (mask.sin6.sin6_addr), | |
364 | &gate.sin6.sin6_addr); | |
365 | else | |
366 | connected_delete_ipv6 (ifp, | |
367 | &addr.sin6.sin6_addr, | |
368 | ip6_masklen (mask.sin6.sin6_addr), | |
369 | &gate.sin6.sin6_addr); | |
370 | break; | |
371 | #endif /* HAVE_IPV6 */ | |
372 | default: | |
373 | /* Unsupported family silently ignore... */ | |
374 | break; | |
375 | } | |
376 | return 0; | |
377 | } | |
378 | \f | |
379 | /* Interface function for reading kernel routing table information. */ | |
380 | int | |
381 | rtm_read_mesg (struct rt_msghdr *rtm, | |
382 | union sockunion *dest, | |
383 | union sockunion *mask, | |
384 | union sockunion *gate) | |
385 | { | |
386 | caddr_t pnt, end; | |
387 | ||
388 | /* Pnt points out socket data start point. */ | |
389 | pnt = (caddr_t)(rtm + 1); | |
390 | end = ((caddr_t)rtm) + rtm->rtm_msglen; | |
391 | ||
392 | /* rt_msghdr version check. */ | |
393 | if (rtm->rtm_version != RTM_VERSION) | |
394 | zlog (NULL, LOG_WARNING, | |
395 | "Routing message version different %d should be %d." | |
396 | "This may cause problem\n", rtm->rtm_version, RTM_VERSION); | |
397 | ||
398 | #define RTMADDRGET(X,R) \ | |
399 | if (rtm->rtm_addrs & (R)) \ | |
400 | { \ | |
401 | int len = WRAPUP (pnt); \ | |
402 | if (((X) != NULL) && af_check (((struct sockaddr *)pnt)->sa_family)) \ | |
403 | memcpy ((caddr_t)(X), pnt, len); \ | |
404 | pnt += len; \ | |
405 | } | |
406 | #define RTMMASKGET(X,R) \ | |
407 | if (rtm->rtm_addrs & (R)) \ | |
408 | { \ | |
409 | int len = WRAPUP (pnt); \ | |
410 | if ((X) != NULL) \ | |
411 | memcpy ((caddr_t)(X), pnt, len); \ | |
412 | pnt += len; \ | |
413 | } | |
414 | ||
415 | /* Be sure structure is cleared */ | |
416 | memset (dest, 0, sizeof (union sockunion)); | |
417 | memset (gate, 0, sizeof (union sockunion)); | |
418 | memset (mask, 0, sizeof (union sockunion)); | |
419 | ||
420 | /* We fetch each socket variable into sockunion. */ | |
421 | RTMADDRGET (dest, RTA_DST); | |
422 | RTMADDRGET (gate, RTA_GATEWAY); | |
423 | RTMMASKGET (mask, RTA_NETMASK); | |
424 | RTMADDRGET (NULL, RTA_GENMASK); | |
425 | RTMADDRGET (NULL, RTA_IFP); | |
426 | RTMADDRGET (NULL, RTA_IFA); | |
427 | RTMADDRGET (NULL, RTA_AUTHOR); | |
428 | RTMADDRGET (NULL, RTA_BRD); | |
429 | ||
430 | /* If there is netmask information set it's family same as | |
431 | destination family*/ | |
432 | if (rtm->rtm_addrs & RTA_NETMASK) | |
433 | mask->sa.sa_family = dest->sa.sa_family; | |
434 | ||
435 | /* Assert read up to the end of pointer. */ | |
436 | if (pnt != end) | |
437 | zlog (NULL, LOG_WARNING, "rtm_read() does't read all socket data."); | |
438 | ||
439 | return rtm->rtm_flags; | |
440 | } | |
441 | ||
442 | void | |
443 | rtm_read (struct rt_msghdr *rtm) | |
444 | { | |
445 | int flags; | |
446 | u_char zebra_flags; | |
447 | union sockunion dest, mask, gate; | |
448 | ||
449 | zebra_flags = 0; | |
450 | ||
451 | /* Discard self send message. */ | |
452 | if (rtm->rtm_type != RTM_GET | |
453 | && (rtm->rtm_pid == pid || rtm->rtm_pid == old_pid)) | |
454 | return; | |
455 | ||
456 | /* Read destination and netmask and gateway from rtm message | |
457 | structure. */ | |
458 | flags = rtm_read_mesg (rtm, &dest, &mask, &gate); | |
459 | ||
460 | #ifdef RTF_CLONED /*bsdi, netbsd 1.6*/ | |
461 | if (flags & RTF_CLONED) | |
462 | return; | |
463 | #endif | |
464 | #ifdef RTF_WASCLONED /*freebsd*/ | |
465 | if (flags & RTF_WASCLONED) | |
466 | return; | |
467 | #endif | |
468 | ||
469 | if ((rtm->rtm_type == RTM_ADD) && ! (flags & RTF_UP)) | |
470 | return; | |
471 | ||
472 | /* This is connected route. */ | |
473 | if (! (flags & RTF_GATEWAY)) | |
474 | return; | |
475 | ||
476 | if (flags & RTF_PROTO1) | |
477 | SET_FLAG (zebra_flags, ZEBRA_FLAG_SELFROUTE); | |
478 | ||
479 | /* This is persistent route. */ | |
480 | if (flags & RTF_STATIC) | |
481 | SET_FLAG (zebra_flags, ZEBRA_FLAG_STATIC); | |
482 | ||
81dfcaa2 | 483 | /* This is a reject or blackhole route */ |
484 | if (flags & RTF_REJECT) | |
485 | SET_FLAG (zebra_flags, ZEBRA_FLAG_REJECT); | |
486 | if (flags & RTF_BLACKHOLE) | |
487 | SET_FLAG (zebra_flags, ZEBRA_FLAG_BLACKHOLE); | |
488 | ||
718e3744 | 489 | if (dest.sa.sa_family == AF_INET) |
490 | { | |
491 | struct prefix_ipv4 p; | |
492 | ||
493 | p.family = AF_INET; | |
494 | p.prefix = dest.sin.sin_addr; | |
495 | if (flags & RTF_HOST) | |
496 | p.prefixlen = IPV4_MAX_PREFIXLEN; | |
497 | else | |
498 | p.prefixlen = ip_masklen (mask.sin.sin_addr); | |
499 | ||
500 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
501 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
502 | &p, &gate.sin.sin_addr, 0, 0, 0, 0); | |
503 | else | |
504 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
505 | &p, &gate.sin.sin_addr, 0, 0); | |
506 | } | |
507 | #ifdef HAVE_IPV6 | |
508 | if (dest.sa.sa_family == AF_INET6) | |
509 | { | |
510 | struct prefix_ipv6 p; | |
511 | unsigned int ifindex = 0; | |
512 | ||
513 | p.family = AF_INET6; | |
514 | p.prefix = dest.sin6.sin6_addr; | |
515 | if (flags & RTF_HOST) | |
516 | p.prefixlen = IPV6_MAX_PREFIXLEN; | |
517 | else | |
518 | p.prefixlen = ip6_masklen (mask.sin6.sin6_addr); | |
519 | ||
520 | #ifdef KAME | |
521 | if (IN6_IS_ADDR_LINKLOCAL (&gate.sin6.sin6_addr)) | |
522 | { | |
523 | ifindex = IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr); | |
524 | SET_IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr, 0); | |
525 | } | |
526 | #endif /* KAME */ | |
527 | ||
528 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
529 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
530 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
531 | else | |
532 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
533 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
534 | } | |
535 | #endif /* HAVE_IPV6 */ | |
536 | } | |
537 | ||
538 | /* Interface function for the kernel routing table updates. Support | |
539 | for RTM_CHANGE will be needed. */ | |
540 | int | |
541 | rtm_write (int message, | |
542 | union sockunion *dest, | |
543 | union sockunion *mask, | |
544 | union sockunion *gate, | |
545 | unsigned int index, | |
546 | int zebra_flags, | |
547 | int metric) | |
548 | { | |
549 | int ret; | |
550 | caddr_t pnt; | |
551 | struct interface *ifp; | |
552 | struct sockaddr_in tmp_gate; | |
553 | #ifdef HAVE_IPV6 | |
554 | struct sockaddr_in6 tmp_gate6; | |
555 | #endif /* HAVE_IPV6 */ | |
556 | ||
557 | /* Sequencial number of routing message. */ | |
558 | static int msg_seq = 0; | |
559 | ||
560 | /* Struct of rt_msghdr and buffer for storing socket's data. */ | |
561 | struct | |
562 | { | |
563 | struct rt_msghdr rtm; | |
564 | char buf[512]; | |
565 | } msg; | |
566 | ||
567 | memset (&tmp_gate, 0, sizeof (struct sockaddr_in)); | |
568 | tmp_gate.sin_family = AF_INET; | |
569 | #ifdef HAVE_SIN_LEN | |
570 | tmp_gate.sin_len = sizeof (struct sockaddr_in); | |
571 | #endif /* HAVE_SIN_LEN */ | |
572 | ||
573 | #ifdef HAVE_IPV6 | |
574 | memset (&tmp_gate6, 0, sizeof (struct sockaddr_in6)); | |
575 | tmp_gate6.sin6_family = AF_INET6; | |
576 | #ifdef SIN6_LEN | |
577 | tmp_gate6.sin6_len = sizeof (struct sockaddr_in6); | |
578 | #endif /* SIN6_LEN */ | |
579 | #endif /* HAVE_IPV6 */ | |
580 | ||
581 | if (routing_sock < 0) | |
582 | return ZEBRA_ERR_EPERM; | |
583 | ||
584 | /* Clear and set rt_msghdr values */ | |
585 | memset (&msg, 0, sizeof (struct rt_msghdr)); | |
586 | msg.rtm.rtm_version = RTM_VERSION; | |
587 | msg.rtm.rtm_type = message; | |
588 | msg.rtm.rtm_seq = msg_seq++; | |
589 | msg.rtm.rtm_addrs = RTA_DST; | |
590 | msg.rtm.rtm_addrs |= RTA_GATEWAY; | |
591 | msg.rtm.rtm_flags = RTF_UP; | |
592 | msg.rtm.rtm_index = index; | |
593 | ||
594 | if (metric != 0) | |
595 | { | |
596 | msg.rtm.rtm_rmx.rmx_hopcount = metric; | |
597 | msg.rtm.rtm_inits |= RTV_HOPCOUNT; | |
598 | } | |
599 | ||
600 | ifp = if_lookup_by_index (index); | |
601 | ||
602 | if (gate && message == RTM_ADD) | |
603 | msg.rtm.rtm_flags |= RTF_GATEWAY; | |
604 | ||
605 | if (! gate && message == RTM_ADD && ifp && | |
606 | (ifp->flags & IFF_POINTOPOINT) == 0) | |
607 | msg.rtm.rtm_flags |= RTF_CLONING; | |
608 | ||
609 | /* If no protocol specific gateway is specified, use link | |
610 | address for gateway. */ | |
611 | if (! gate) | |
612 | { | |
613 | if (!ifp) | |
614 | { | |
615 | zlog_warn ("no gateway found for interface index %d", index); | |
616 | return -1; | |
617 | } | |
618 | gate = (union sockunion *) & ifp->sdl; | |
619 | } | |
620 | ||
621 | if (mask) | |
622 | msg.rtm.rtm_addrs |= RTA_NETMASK; | |
623 | else if (message == RTM_ADD) | |
624 | msg.rtm.rtm_flags |= RTF_HOST; | |
625 | ||
626 | /* Tagging route with flags */ | |
627 | msg.rtm.rtm_flags |= (RTF_PROTO1); | |
628 | ||
629 | /* Additional flags. */ | |
630 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
631 | msg.rtm.rtm_flags |= RTF_BLACKHOLE; | |
81dfcaa2 | 632 | if (zebra_flags & ZEBRA_FLAG_REJECT) |
633 | msg.rtm.rtm_flags |= RTF_REJECT; | |
634 | ||
718e3744 | 635 | |
636 | #ifdef HAVE_SIN_LEN | |
637 | #define SOCKADDRSET(X,R) \ | |
638 | if (msg.rtm.rtm_addrs & (R)) \ | |
639 | { \ | |
640 | int len = ROUNDUP ((X)->sa.sa_len); \ | |
641 | memcpy (pnt, (caddr_t)(X), len); \ | |
642 | pnt += len; \ | |
643 | } | |
644 | #else | |
645 | #define SOCKADDRSET(X,R) \ | |
646 | if (msg.rtm.rtm_addrs & (R)) \ | |
647 | { \ | |
648 | int len = ROUNDUP (sizeof((X)->sa)); \ | |
649 | memcpy (pnt, (caddr_t)(X), len); \ | |
650 | pnt += len; \ | |
651 | } | |
652 | #endif /* HAVE_SIN_LEN */ | |
653 | ||
654 | pnt = (caddr_t) msg.buf; | |
655 | ||
656 | /* Write each socket data into rtm message buffer */ | |
657 | SOCKADDRSET (dest, RTA_DST); | |
658 | SOCKADDRSET (gate, RTA_GATEWAY); | |
659 | SOCKADDRSET (mask, RTA_NETMASK); | |
660 | ||
661 | msg.rtm.rtm_msglen = pnt - (caddr_t) &msg; | |
662 | ||
663 | ret = write (routing_sock, &msg, msg.rtm.rtm_msglen); | |
664 | ||
665 | if (ret != msg.rtm.rtm_msglen) | |
666 | { | |
667 | if (errno == EEXIST) | |
668 | return ZEBRA_ERR_RTEXIST; | |
669 | if (errno == ENETUNREACH) | |
670 | return ZEBRA_ERR_RTUNREACH; | |
671 | ||
672 | zlog_warn ("write : %s (%d)", strerror (errno), errno); | |
673 | return -1; | |
674 | } | |
675 | return 0; | |
676 | } | |
677 | ||
678 | \f | |
679 | #include "thread.h" | |
680 | #include "zebra/zserv.h" | |
681 | ||
718e3744 | 682 | /* For debug purpose. */ |
683 | void | |
684 | rtmsg_debug (struct rt_msghdr *rtm) | |
685 | { | |
686 | char *type = "Unknown"; | |
687 | struct message *mes; | |
688 | ||
689 | for (mes = rtm_type_str; mes->str; mes++) | |
690 | if (mes->key == rtm->rtm_type) | |
691 | { | |
692 | type = mes->str; | |
693 | break; | |
694 | } | |
695 | ||
696 | zlog_info ("Kernel: Len: %d Type: %s", rtm->rtm_msglen, type); | |
697 | rtm_flag_dump (rtm->rtm_flags); | |
698 | zlog_info ("Kernel: message seq %d", rtm->rtm_seq); | |
699 | zlog_info ("Kernel: pid %d", rtm->rtm_pid); | |
700 | } | |
701 | ||
702 | /* This is pretty gross, better suggestions welcome -- mhandler */ | |
703 | #ifndef RTAX_MAX | |
704 | #ifdef RTA_NUMBITS | |
705 | #define RTAX_MAX RTA_NUMBITS | |
706 | #else | |
707 | #define RTAX_MAX 8 | |
708 | #endif /* RTA_NUMBITS */ | |
709 | #endif /* RTAX_MAX */ | |
710 | ||
711 | /* Kernel routing table and interface updates via routing socket. */ | |
712 | int | |
713 | kernel_read (struct thread *thread) | |
714 | { | |
715 | int sock; | |
716 | int nbytes; | |
717 | struct rt_msghdr *rtm; | |
718 | ||
719 | union | |
720 | { | |
721 | /* Routing information. */ | |
722 | struct | |
723 | { | |
724 | struct rt_msghdr rtm; | |
725 | struct sockaddr addr[RTAX_MAX]; | |
726 | } r; | |
727 | ||
728 | /* Interface information. */ | |
729 | struct | |
730 | { | |
731 | struct if_msghdr ifm; | |
732 | struct sockaddr addr[RTAX_MAX]; | |
733 | } im; | |
734 | ||
735 | /* Interface address information. */ | |
736 | struct | |
737 | { | |
738 | struct ifa_msghdr ifa; | |
739 | struct sockaddr addr[RTAX_MAX]; | |
740 | } ia; | |
741 | ||
742 | #ifdef RTM_IFANNOUNCE | |
743 | /* Interface arrival/departure */ | |
744 | struct | |
745 | { | |
746 | struct if_announcemsghdr ifan; | |
747 | struct sockaddr addr[RTAX_MAX]; | |
748 | } ian; | |
749 | #endif /* RTM_IFANNOUNCE */ | |
750 | ||
751 | } buf; | |
752 | ||
753 | /* Fetch routing socket. */ | |
754 | sock = THREAD_FD (thread); | |
755 | ||
756 | nbytes= read (sock, &buf, sizeof buf); | |
757 | ||
758 | if (nbytes <= 0) | |
759 | { | |
760 | if (nbytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN) | |
761 | zlog_warn ("routing socket error: %s", strerror (errno)); | |
762 | return 0; | |
763 | } | |
764 | ||
9bcdb638 | 765 | thread_add_read (zebrad.master, kernel_read, NULL, sock); |
718e3744 | 766 | |
726f9b2b | 767 | if (IS_ZEBRA_DEBUG_KERNEL) |
768 | rtmsg_debug (&buf.r.rtm); | |
718e3744 | 769 | |
770 | rtm = &buf.r.rtm; | |
771 | ||
772 | switch (rtm->rtm_type) | |
773 | { | |
774 | case RTM_ADD: | |
775 | case RTM_DELETE: | |
776 | rtm_read (rtm); | |
777 | break; | |
778 | case RTM_IFINFO: | |
779 | ifm_read (&buf.im.ifm); | |
780 | break; | |
781 | case RTM_NEWADDR: | |
782 | case RTM_DELADDR: | |
783 | ifam_read (&buf.ia.ifa); | |
784 | break; | |
785 | #ifdef RTM_IFANNOUNCE | |
786 | case RTM_IFANNOUNCE: | |
787 | ifan_read (&buf.ian.ifan); | |
788 | break; | |
789 | #endif /* RTM_IFANNOUNCE */ | |
790 | default: | |
726f9b2b | 791 | if (IS_ZEBRA_DEBUG_KERNEL) |
792 | zlog_info("Unprocessed RTM_type: %d", rtm->rtm_type); | |
718e3744 | 793 | break; |
794 | } | |
795 | return 0; | |
796 | } | |
797 | ||
798 | /* Make routing socket. */ | |
799 | void | |
800 | routing_socket () | |
801 | { | |
edd7c245 | 802 | if ( zserv_privs.change (ZPRIVS_RAISE) ) |
803 | zlog_err ("routing_socket: Can't raise privileges"); | |
804 | ||
718e3744 | 805 | routing_sock = socket (AF_ROUTE, SOCK_RAW, 0); |
806 | ||
807 | if (routing_sock < 0) | |
808 | { | |
edd7c245 | 809 | if ( zserv_privs.change (ZPRIVS_LOWER) ) |
810 | zlog_err ("routing_socket: Can't lower privileges"); | |
718e3744 | 811 | zlog_warn ("Can't init kernel routing socket"); |
812 | return; | |
813 | } | |
814 | ||
815 | if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0) | |
816 | zlog_warn ("Can't set O_NONBLOCK to routing socket"); | |
edd7c245 | 817 | if ( zserv_privs.change (ZPRIVS_LOWER) ) |
818 | zlog_err ("routing_socket: Can't lower privileges"); | |
718e3744 | 819 | |
820 | /* kernel_read needs rewrite. */ | |
9bcdb638 | 821 | thread_add_read (zebrad.master, kernel_read, NULL, routing_sock); |
718e3744 | 822 | } |
823 | ||
824 | /* Exported interface function. This function simply calls | |
825 | routing_socket (). */ | |
826 | void | |
827 | kernel_init () | |
828 | { | |
829 | routing_socket (); | |
830 | } |